Properties of the 67P/Churyumov-Gerasimenko interior revealed by CONSERT radar-Reference-Cited by-同舟云学术

Properties of the 67P/Churyumov-Gerasimenko interior revealed by CONSERT radar

Published:2015-07-31 Issue:6247 Volume:349 Page:
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Kofman Wlodek¹,Herique Alain¹,Barbin Yves²,Barriot Jean-Pierre³,Ciarletti Valérie⁴,Clifford Stephen⁵,Edenhofer Peter⁶,Elachi Charles⁷,Eyraud Christelle⁸,Goutail Jean-Pierre⁴,Heggy Essam⁷⁹,Jorda Laurent¹⁰,Lasue Jérémie¹¹,Levasseur-Regourd Anny-Chantal¹²,Nielsen Erling¹³,Pasquero Pierre¹,Preusker Frank¹⁴,Puget Pascal¹,Plettemeier Dirk¹⁵,Rogez Yves¹,Sierks Holger¹³,Statz Christoph¹⁵,Svedhem Hakan¹⁶,Williams Iwan¹⁷,Zine Sonia¹,Van Zyl Jakob⁷

Affiliation:

1. Université Grenoble Alpes, IPAG, F-38000 Grenoble, France (2) Centre National de la Recherche Scientifique (CNRS), Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), F-38000 Grenoble, France.

2. MIO, UM 110, CNRS-Institut National des Sciences de l’Univers (INSU), Université de Toulon, Aix-Marseille Université, IRD 83957 La Garde, France.

3. Geodesy Observatory of Tahiti BP6570, 98702 Faa'a, Tahiti.

4. Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) (UPSay); Université Pierre et Marie Curie (UPMC) (Sorbonne Univ.); CNRS/INSU; Laboratoire Atmosphéres, Milieux, Observations Spatiales (LATMOS)-Institut Pierre-Simon Laplace (IPSL), 11 Boulevard d’Alembert, 78280 Guyancourt, France.

5. Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, TX 77058, USA.

6. Ruhr-University of Bochum, Faculty of Electrical Engineering and Information Technology, 44780 Bochum, Germany.

7. Jet Propulsion Laboratory, 4800 Oak Grove Drive, MS 300-243E, Pasadena, CA 91109, USA.

8. Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel UMR 7249, 13013 Marseille, France.

9. University of Southern California, Ming Hsieh Department of Electrical Engineering, Viterbi School of Engineering, Los Angeles, CA 90089, USA.

10. Laboratoire d’Astrophysique de Marseille Pôle de l’Étoile Site de Château-Gombert 38, Rue Frédéric Joliot-Curie 13388 Marseille, France.

11. Université de Toulouse; UPS-OMP; IRAP; (2) CNRS; IRAP; 9 Avenue Colonel Roche, BP 44 346, F-31028 Toulouse Cedex 4, Toulouse, France.

12. UPMC (Sorbonne Univ.); UVSQ (UPSay); CNRS/INSU; LATMOS-IPSL, BC 102, 4 place Jussieu, 75005 Paris, France.

13. Max-Planck-Institüt fur Sonnensystemforschung (MPS), Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany.

14. German Aerospace Center (DLR) Rutherfordstraße 2 12489 Berlin, Germany.

15. Technische Universitaet Dresden Helmholtzstraße 10 D-01069 Dresden, Germany.

16. European Space Agency (ESA)/European Space Research and Technology Centre (ESTEC) Noordwijk, Netherlands.

17. Queen Mary University of London, Mile End Road, London E1 4NS, UK.

Abstract

The Philae lander provides a unique opportunity to investigate the internal structure of a comet nucleus, providing information about its formation and evolution in the early solar system. We present Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) measurements of the interior of Comet 67P/Churyumov-Gerasimenko. From the propagation time and form of the signals, the upper part of the “head” of 67P is fairly homogeneous on a spatial scale of tens of meters. CONSERT also reduced the size of the uncertainty of Philae’s final landing site down to approximately 21 by 34 square meters. The average permittivity is about 1.27, suggesting that this region has a volumetric dust/ice ratio of 0.4 to 2.6 and a porosity of 75 to 85%. The dust component may be comparable to that of carbonaceous chondrites.

Funder

MPS

CNES

DLR

CNRS

Université Joseph Fourier

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference42 articles.

1. Radar Soundings of the Subsurface of Mars